<!DOCTYPE html>
<html>
<body>
<p>Click the button to display the base URI of the document.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> The baseURI property is not supported in Internet Explorer.</p>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.baseURI;
  window.alert(x);
}
</script>
</body>
</html>